Cardington UAS Presented by Robert Clark Instrument Technician
What is a UAS? • UAS stands for Unmanned Aircraft System • The term UAS generally refers to the entire operating equipment, including aircraft, ground control station and wireless data link • UAS technology increasingly of interest in many civil applications, such as surveillance, aerial photography, security and meteorology • UAS technology offers us exciting new potential for atmospheric studies, including temperature & humidity profiles, wind speeds and direction, boundary layer height & turbulence, fog, cloud & aerosol spectra, etc
Cardington UAS Specifications: • Wingspan: 1. 8 m • Length: 1. 2 m • Weight (Empty): 1. 5 kg • Payload: 1. 5 kg • Max. Speed: 18 m/sec • Flight Duration: Up to 45 min
Cardington UAS Airframe Details: • Model: MAJA ( Manufactured by Bormatec) • Construction: EPP, Correx sheet • No. of channels: 4 • Control Surfaces: Elevator, ailerons, rudder • Motor: Electric, with Electronic Speed Controller (ESC) • Power Source: Lithium Polymer (Li. Po) batteries
Cardington Modifications (1) Sensor housing: • Temperature sensor (fast PRT) • Humidity sensor (Vaisala HMP 44)
Cardington Modifications (2) Sensor Interface Unit: • Correx enclosure • Integral barometric pressure sensor (Druck RPT 410) • In-house signal conditioning circuitry • Proprietary ADC board and SD card (Sky. Circuits)
Cardington UAS: Internal Layout Temp & Humidity Sensor Leads Pressure Sensor Interface Unit 2. 4 GHz Receiver Pitot Probe Battery Packs Autopilot GPS Antenna I/P RF Antenna
Cardington Modifications (3) UAS Launcher: Desirable Attributes • Lightweight • Collapsible • Single-person launch Launcher Enhancements: • Increased power • Carriage support • Self-cocking mechanism • Positive release • 100% improved reliability!
Autopilot: Sky. Circuits SC 2 Autopilot Sensors: • 3 -axis magnetometer • 3 -axis accelerometer • 3 -axis gyroscope • Dynamic & static pressure Functions: • Selectable levels of autonomy • GPS navigation • Monitor all flight parameters • Hardware-In-The-Loop (HIL) support • Internal RF module (868 MHz) for comms with Ground Control Station (GCS)
Autopilot Communications With Ground Control Station (GCS) GCS To UAS Communications: • Upload new routes • Issue commands • Issue mission scripts/mission updates UAS To GCS Communications: • Transmit real-time flight data • Transmit real-time sensor info
Autopilot: Planning A Route Example from ‘GCS’ manual: Main user interface screen Example mission (extract from ‘Flight’ manual)
Cardington UAS Data: Autonomous Flight on 23/11/12 Temperature (Deg. C) RH (%) PTU Plots: • Ascent & descent profile for Temp & RH • Ascent profiles more densely populated as UAS takes longer to climb than to descend • Good evidence of stable boundary layer conditions with temperature inversion • Pressure plot shows UAS sensor v MO sensor • Winds data currently being processed Pressure (mb)
Cardington UAS The End
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